<!DOCTYPE html>
<html>
<head>
    <meta charset ="utf-8" />
    <title></tit1e>
    <style type="text/css">
    #p1{font-weight: 100;}
    #p2{font-weight: 400;}
    #p3{font-weight: 700;}
    #p4{font-weight: 900;}
    </style>
</head>
<body>
    <p id="p1">字体粗细为:100(1ighter )</p>
    <p id="p2">字体粗细为:400(norma1k)</p>
    <p id="p3">字体粗细为:700(bold)</p>
    <p id="p4">字体粗细为:900(bolder )</p>
</body>
</html>
   